2026ewa | Transient Name Server

RA/DEC (2000)

13:11:03.482 +49:06:32.07

197.764508352 +49.1089069992

Type

SN Ia-CSM

Redshift

0.056

Discovery Report Classification Report

Reporting Group

ATLAS

Discovering Data Source

ATLAS

Discovery Date

2026-03-05 11:13:17.184

TNS AT

Public

Discovery Mag

18.391

Filter

orange-ATLAS

Reporter/s

J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), M. R. Alarcón, J. Licandro, P. Nichita (IAC), S. J. Smartt, K. W. Smith (Oxford/QUB), D. R. Young, M. Nicholl, M. Fulton, M. McCollum, T. Moore, J. Weston, X. Sheng, C. R. Angus, A. Wilson, A. Aamer, D. Magill, P. J. Broda, A. J. Smith (QUB), P. Ramsden (Birmingham/QUB), L. Shingles (GSI/QUB), S. Srivastav, J. H. Gillanders, H. Stevance, A. J. Cooper, F. Stoppa, J. Tweddle, L. Eastman (Oxford), L. Rhodes (TSI/McGill), A. Rest (STScI), T.-W. Chen (NCU), C. Stubbs (Harvard), J. S. Sommer (LMU), B. P. Schmidt (ANU)

NED SIMBAD DECaLS PanSTARRS-1 SkyMapper VizieR WISE DSS ADS

Light curves

Pointer position (MJD, Mag, Abs.Mag): (0.00, 0.00, 0.00)

Spectra

Select	ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type
	23319	2026-03-21 10:03:46	FLWO-1.5m / FAST	3600	Yize Dong (Harvard/CfA), S. Karthik Yadavalli (Harvard/CfA)	Yize Dong (Harvard/CfA)	VHU-TDA	tns_2026ewa_2026-03-21_10-03-46_FLWO-1.5m_FAST_VHU-TDA.ascii	tns_2026ewa_2026-03-21_10-03-46_FLWO-1.5m_FAST_VHU-TDA.fits	Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks
	23306	2026-03-19 21:15:00	BL41 / FOSC-E5535	9000	Claudio Balcon	Claudio Balcon	None	tns_2026ewa_2026-03-19_21-15-00_BL41_FOSC-E5535_None.dat	tns_2026ewa_2026-03-19_21-15-00_BL41_FOSC-E5535_None.fit	Object
Binning factor: (rounded to nearest integer >1) Mouse hovers at WL: 0 (rest), 0 (observed) ▌Show H at z=v_exp= km/s ▌Show He at z=v_exp= km/s ▌Show He II at z=v_exp= km/s ▌Show C II at z=v_exp= km/s ▌Show C III at z=v_exp= km/s ▌Show C IV at z=v_exp= km/s ▌Show N II at z=v_exp= km/s ▌Show N III at z=v_exp= km/s ▌Show N IV at z=v_exp= km/s ▌Show N V at z=v_exp= km/s ▌Show O at z=v_exp= km/s ▌Show [O I] at z=v_exp= km/s ▌Show O II at z=v_exp= km/s ▌Show [O II] at z=v_exp= km/s ▌Show [O III] at z=v_exp= km/s ▌Show O V at z=v_exp= km/s ▌Show O VI at z=v_exp= km/s ▌Show Na at z=v_exp= km/s ▌Show Mg at z=v_exp= km/s ▌Show Mg II at z=v_exp= km/s ▌Show Si II at z=v_exp= km/s ▌Show S II at z=v_exp= km/s ▌Show Ca II at z=v_exp= km/s ▌Show [Ca II] at z=v_exp= km/s ▌Show Fe II at z=v_exp= km/s ▌Show Fe III at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Å at z=v_exp= km/s ▌Show Tellurics ▌Show Galaxy lines at z= ▌Show WR-WN at z=v_exp= km/s ▌Show WR-WC/O at z=v_exp= km/s Remarks

Light Curves

Filter

Tel / Inst

Obs-date range

JD Range

Photometry

r-WFST

WFST_WFST-WFC

2026-03-04 16:35:02 - 2026-03-04 16:35:02

2461104.191 - 2461104.191

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
568284	2026-03-04 16:35:02	2461104.191	18.61	0.09		ABMag	r-WFST	WFST_WFST-WFC	30

g-WFST

WFST_WFST-WFC

2026-03-04 15:30:14 - 2026-03-04 15:30:14

2461104.146 - 2461104.146

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
568283	2026-03-04 15:30:14	2461104.146			18.13	ABMag	g-WFST	WFST_WFST-WFC	30		[Last non detection]

Clear-

LAST_LAST-Cam

2026-02-25 01:55:36 - 2026-03-16 01:04:00

2461096.58028 - 2461115.54444

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
565077	2026-03-16 01:04:00	2461115.54444	17.18			ABMag	Clear-	LAST_LAST-Cam	360
565076	2026-02-25 01:55:36	2461096.58028			20.01	ABMag	Clear-	LAST_LAST-Cam	400		[Last non detection]

L-GOTO

GOTO-N_GOTO-2

2026-03-02 00:47:44 - 2026-03-07 00:59:39

2461101.53315 - 2461106.541422

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
563804	2026-03-07 00:59:39	2461106.541422	17.93	0.06		ABMag	L-GOTO	GOTO-N_GOTO-2	180
563803	2026-03-02 00:47:44	2461101.53315			19	ABMag	L-GOTO	GOTO-N_GOTO-2	180		[Last non detection]

w-P1

PS2_GPC2

2026-05-25 06:28:41 - 2026-05-25 06:28:41

2461185.76992 - 2461185.76992

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
590502	2026-05-25 06:28:41	2461185.76992	16.7	0.01	22	ABMag	w-P1	PS2_GPC2	45	Robot

g-ZTF

P48_ZTF-Cam

2026-03-09 10:57:02 - 2026-03-20 09:55:26

2461108.9562731 - 2461119.9134954

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
568810	2026-03-20 09:55:26	2461119.9134954	16.6083	0.0360664		ABMag	g-ZTF	P48_ZTF-Cam
568809	2026-03-09 10:57:02	2461108.9562731	17.4979	0.042751		ABMag	g-ZTF	P48_ZTF-Cam

orange-ATLAS

ATLAS-MLO_ATLAS-01

2026-03-04 11:51:50 - 2026-03-05 11:13:17

2461103.99433 - 2461104.96756

Photometry

ID	Obs-date	JD	Mag. / Flux	Err	Lim. Mag./Flux	Units	Filter	Tel / Inst	Exp-time	Observer/s	Remarks
562785	2026-03-05 11:13:17	2461104.96756	18.391	0.142	18.91	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot
562784	2026-03-04 11:51:50	2461103.99433			18.77	ABMag	orange-ATLAS	ATLAS-MLO_ATLAS-01	30	Robot	[Last non detection]

AT Reports

ID	Time received (UT)	Sender	Reporter/s	Reporting group	Disc. Data Source	RA	DEC	Discovery date (UT)	Discovery Mag.	Filter	AT Type	Internal name	Assoc. Groups	ADS Bibcode	Unreal
307830	2026-06-09 10:39:16	PS1_Bot1	K. C. Chambers, T. de Boer, J. Fairlamb et al.	Pan-STARRS	Pan-STARRS	13:11:03.482	+49:06:32.07	2026-05-25 06:28:41.088	16.7	w-P1	PSN	PS26bvw	Pan-STARRS		N
296773	2026-03-20 11:02:54	Fritz	Jesper Sollerman (SU), Christoffer Fremling (Caltech), Daniel Perley (LJMU) et al.	ZTF	ZTF	13:11:03.505	+49:06:32.08	2026-03-09 10:57:01.995	17.4979	g-ZTF	PSN	ZTF26aakhenm	ZTF		N
296426	2026-03-20 10:34:52	WFST_SN	Zelin Xu, Dezheng Meng, Ji-an Jiang et al.	WFST	WFST	13:11:03.490	+49:06:32.06	2026-03-04 16:35:02.400	18.61	r-WFST	PSN	WFST260304bcarj	WFST		N
294645	2026-03-16 06:37:37	LAST_Bot1	R. Konno (WIS), E. A. Zimmerman (WIS), A. Horowicz (WIS) et al.	LAST	LAST	13:11:03.497	+49:06:32.34	2026-03-16 01:03:59.616	17.18	Clear-	PSN		LAST		N
294084	2026-03-10 11:28:30	GOTO_bot	D. O'Neill, M. Pursiainen, K. Ackley et al.	GOTO	GOTO	13:11:03.495	+49:06:32.40	2026-03-07 00:59:38.688	17.93	L-GOTO	PSN	GOTO26btr	GOTO		N
293619	2026-03-05 13:21:48	ATLAS_Bot1	J. Tonry, L. Denneau, H. Weiland (IfA, University of Hawaii) et al.	ATLAS	ATLAS	13:11:03.458	+49:06:32.26	2026-03-05 11:13:17.184	18.391	orange-ATLAS	PSN	ATLAS26cpe	ATLAS	2026TNSTR.919....1T	N

Classification Reports

Time received (UT)

Sender

Classifier/s

Group

Classification

Redshift

Spectra

Related files

Assoc. Groups

End prop. period

Remarks

ADS Bibcode

23318

2026-03-22 11:23:06

Yize Dong

Yize Dong (Harvard/CfA), S. Karthik Yadavalli (Harvard/CfA), Anya Nugent (Harvard/CfA), V. Ashley Villar (Harvard/CfA), Alex Gagliano (Harvard/CfA), Kaylee de Soto (Harvard/CfA), Danielle Frostig(Harvard/CfA), Edo Berger (Harvard/CfA), Wasundara Athukoralalage (Harvard/CfA), Will Golay (Harvard/CfA), Daichi Hiramatsu (Harvard/CfA), Yuyang Chen (Harvard/CfA)

VHU-TDA

SN Ia-CSM

0.056

VHU-TDA

Strong narrow H lines. Classified as a Ia-CSM using SNID-SAGE.

2026TNSCR1241....1D

Related files

File	Comments	Last Modified (UT)	Modified By
tns_2026ewa_atrep_23318_VHU-TDA.png		2026-03-22 11:56:35	Yize Dong

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
23319	2026-03-21 10:03:46	FLWO-1.5m / FAST	3600	Yize Dong (Harvard/CfA), S. Karthik Yadavalli (Harvard/CfA)	Yize Dong (Harvard/CfA)	VHU-TDA	tns_2026ewa_2026-03-21_10-03-46_FLWO-1.5m_FAST_VHU-TDA.ascii	tns_2026ewa_2026-03-21_10-03-46_FLWO-1.5m_FAST_VHU-TDA.fits	Object

23305

2026-03-20 13:21:16

Claudio Balcon

Claudio Balcon (Belluno A.O. ISSP)

None

0.05549

The low S/N spectrum shows a blue continuum with narrow H-alpha emission, features often seen in young CC SNe, likely a type II or IIn SN. Redshift taken from NED.

2026TNSCR1207....1B

Spectra

ID	Obs-date (UT)	Tel / Inst	Exp-Time	Observer/s	Reducer/s	Group	Spectrum ascii file	Spectrum fits file	Spec. Type	Assoc. Groups	End prop. period	Remarks
23306	2026-03-19 21:15:00	BL41 / FOSC-E5535	9000	Claudio Balcon	Claudio Balcon	None	tns_2026ewa_2026-03-19_21-15-00_BL41_FOSC-E5535_None.dat	tns_2026ewa_2026-03-19_21-15-00_BL41_FOSC-E5535_None.fit	Object

Comments

Object coordinates updated

Object coordinates updated according to AT-report 307830 of Group Pan-STARRS
Previous RA, DEC: 13:11:03.490, +49:06:32.06 (197.764542, +49.108906)
Updated RA, DEC: 13:11:03.482, +49:06:32.07 (197.764508352, +49.1089069992)

Object coordinates updated

Object coordinates updated according to AT-report 296426 of Group WFST
Previous RA, DEC: 13:11:03.458, +49:06:32.26 (197.76441, +49.10896)
Updated RA, DEC: 13:11:03.490, +49:06:32.06 (197.764542, +49.108906)

SN 2026ewa

Spectra

Light curves

Comments

Object coordinates updated

Object coordinates updated